... liquid and s (FireWall A ,B) Class A , B Foam Extinguishing Agent Our (FireWall A,B) Class A , B foam extinguishing agents extinguish fires ... in the content of applied mixture may range from 0.1~1%, depending upon the size and intensity of the fire, ... meets the standards and expectations of biodegradability. The Class A , B foam extinguishing agentss micro bubble consistency and its special surfactant ...